J. JOSEPH SMITH, Circuit Judge.
Armour Research Foundation of Illinois Institute of Technology (Armour), holder of the Camras U. S. Patent No. 2,694,656, for magnetic recording tape, magnetic iron oxides suitable for use in magnetic recording tape, and methods of production of the oxides, appeals from an adverse judgment in a declaratory judgment action brought by Audio Devices, Inc. (Audio), accused of infringement, against Minnesota Mining and Manufacturing, a licensee...
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